chore: Add engines and volta fields to package.json

[clintcs]

🚀 Description

The engines field of package.json is supported by PNPM and is thus version-manager independent. PNPM will fail if its version is out of range. See my code comment for why we should support a specific range.

Volta, meanwhile, is our preferred version manager. It will look to the volta field of package.json to determine which Node.js and PNPM versions to use.

Note that Volta's PNPM support is experimental and requires the environmental variable VOLTA_FEATURE_PNPM to be set to 1.

We should probably upgrade to a version 6.1 lock file and PNPM 8 as well, though I considered it out of scope. Happy to follow up with another PR if you'd like.

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[ynotdraw]

We should probably upgrade to a version 6.1 lock file and PNPM 8 as well, though I considered it out of scope.

Agreed on both points!

Happy to follow up with another PR if you'd like.

If you have the time, it'd be greatly appreciated!

[clintcs]

If you have the time, it'd be greatly appreciated!

Will do!